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AM256 – 8 bit Rotary Magnetic Sensor IC

AM256 – 8 bit Rotary Magnetic Sensor IC

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The IC senses the angular position of a permanent magnet placed above the chip. The permanent magnet must be diametrically polarized and of cylindrical shape.


The AM256 uses Hall sensor technology to detect the magnetic flux density distribution at the surface of the silicon. Hall sensors are placed in a circular array around the center of the IC and deliver a voltage representation of magnetic field distribution.


The sine and cosine voltage outputs from the sensor array vary with magnet position. The sine and cosine signals are then converted to absolute angle position with a fast eight bit flash interpolator.


The absolute angle position value from the interpolator is output through a parallel binary interface or a serial SSI interface. The relative changes of angle position are output through incremental A QUAD B encoder signals. The resolution of incremental output is selectable between 128 and 256 counts per turn with an external pin.


  • Contactless angular position encoding over 360°
  • Ideal for harsh environments due to magnetic sensing
  • Complete system-on-chip solution
  • 8 bit absolute encoder
  • Output options:
    • Incremental
    • Parallel
    • Serial SSI
    • Analogue sinusoidal
  • Factory optimised linearity
  • High rotational speed up to 60,000 rpm
  • 5 V power supply
  • Low power consumption 13 mA typical.
  • Extended operating temperature range (-40 °C to 125 °C)
  • SMD package SSOP28

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Lead time up to: 15 working days